In Pictures

An aerial view of Dianchi Lake from a passenger plane in November 2018. Photo: China Foto Press

The 18-metre-high Yellow Duck is pictured at Dianchi Lake in December 2017. Photo: China Foto Press

A boy is covered by foam floating on the surface of the Dianchi Lake back in 2008. Photo: China Foto Press

A large amount of algae has bloomed in Dianchi Lake, turning the water a vibrant green in 2007 in a stretch along the shore. Photo: AFP

A worker collects rubbish from the enter-lake channel of Panlong River, a water resource of Dianchi Lake, in 2011. It is reported that trash from the riviera running into Dianchi is one of the main pollution sources of Dianchi Lake. Photo: Imaginechina

A worker cleans algae at the Dianchi Lake in 2010. Photo: REUTERS

A view of the lotus pond at the “cofferdam” at a park at Dianchi Lake in 2015. Photo: Imaginehina

Fishermen lifting nets on Lake Dianchi in 2011. Photo: Alamy

Clean-up work being carried out in Dianchi Lake in 2017. Photo: Alamy

Fishing boats leave a port to resume fishing as Dianchi Lake enters the fishing season in 2018. Photo: Imaginechina

Aerial view of Kunming, the capital of Yunnan province in Southern China, from XiShan Western Hill in 2017. Photo: Alamy